Kerri's father bill was a baker. Out of his usual morning batch of cookies bill burned the first 2 dozen cookies. He gave half of what was left to Keri to take to scol. He wrapped up half of the remaining cookies and have them to a group of fireman. He gave half of what was left to the policeman. If bill had only 7 cookies left, how many cookies were in the original batch?

Answer 1

2*7 = 14 before giving to cop
2*14 = 28 before giving to firemen
2*28=56 before giving to Keri
56+2*12 = 80 cookies to start with

start with 80
burned 24, leaving 56
Keri got 28, leaving 28
firemen got 14, leaving 14
cop got 7, leaving 7

Answer 2

7x2
14x2
28x2
56+12x2
80